What does the cryptic crossword clue "Gas lit behind unit for a physicist (5)" mean?

The definition is "Gas". The wordplay uses charade, parts. RAD (synonym of "unit for a physicist") [last letter: "behind"] + ON (synonym of "lit"); definition: "Gas" The answer is RADON.

Gas lit behind unit for a physicist (5)

Times Cryptic #29104 | 14 Across | 2024-12-19 flower

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